#!/bin/bash

function s1_generate_a_series_of_files(){
	for i in $(seq 1 100);
	do 
	echo $i > /tmp/new_file$i;
	done
}

function s2_list_4_files_in_long_format_about_account_and_group(){
	ls -l /etc/passwd /etc/shadow /etc/group /etc/gshadow | sort -d
}

function s3_find_items_related_to_given_username(){
	grep -h $1 /etc/passwd /etc/shadow | sort -d
}

function s4_find_items_related_to_given_group_name(){
	grep -h $1 /etc/group /etc/gshadow | sort -d 
}

function s5_create_groups_for_given_group_names(){
	groupadd rnd 
	groupadd itoperation
}

function s6_create_users_and_set_their_groups_as_required(){
	useradd adam
	useradd bob
	useradd calvin 
	useradd david
	useradd edward
	usermod -a -G rnd adam edward
	usermod -a -G itoperation calvin david
}

function s7_change_users_shell(){
	usermod -s /usr/bin/sh adam 
	usermod -s /usr/bin/sh edward 
}

function s8_set_password_change_policly(){
	change -m 10 -M 60 -W 10 adam 
	change -m 10 -M 60 -W 10 bob
	change -m 10 -M 60 -W 10 calvin
	change -m 10 -M 60 -W 10 david
	change -m 10 -M 60 -W 10 edward
}

function s9_set_password_for_five_users(){
	echo -e "Adam;${1}\nBob:${2}\nCalvin:${3}\nDavid:${4}\nEdward:${5}" |    chpasswd
}

function s10_lock_bobs_password(){
	sudo usermod -L bob
}

function s11_include_adam_into_wheel_group(){
	sudo usermod -aG wheel adam
}

function s12_change_files_permission(){
	for i in $(seq 3 3 99 ); do
	sudo chmod 640 "/tmp/new_file$i"
	done
}
